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USA Made Total Water Hardness Test Strips 0-500 ppm for Water Quality Tests [100 Strips in Moisture Wicking Bottle] - Walmart.com - Walmart.com
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Hydrion Water Hardness Test Kit (packed with two rolls of test paper 0-20 grains per gallon and 10-50 grains per gallon): Amazon.co.uk: Garden & Outdoors
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Public works . , under normal conditions, of.62 of a grain per gallon of water, and under severe con-ditions as high as 5.0 grains per gallon. The turbidity ofthe raw water
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Water Hardness
Water Hardness Map of the United States - H2O Distributors